There are 2 function keys that can be very useful in Dreamweaver.

F5 - Use this key to see changes that you have made. When you type changes into the code window, they don't immediately show up in the design window. Youcan click inside the design window, or just hit F5. The reverse is also true, when you make changes in teh design window, pressing F5 will show you teh code that creates those changes.

F12 - This key will save a temporary version of your web page and open it in Internet Explorer, so you can see what your page would actually look like on the internet.

Note: Remeber that peoples screen resolutions are different, and not everyone uses the same web browser (Netscape, Firefox, Safari, etc.) If you really want to test your web page, save a copy and test it at different screen resolutions and in different web browsers. Not all web browsers interpret HTML code the same way, though things are a bit more uuniversal now than they were in the past. Connection speeds can also be a problem for some people, so heavy graphics content can sometimes have a negative effect on the person visiting your site.